* Mini dd implementation for busybox
*
*
- * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
+ * Copyright (C) 2000,2001 Matt Kraai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
*/
-#include "busybox.h"
-
#include <sys/types.h>
+#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
+#include "busybox.h"
+
static const struct suffix_mult dd_suffixes[] = {
{ "c", 1 },
int dd_main(int argc, char **argv)
{
- int i, ifd, ofd, oflag, sync = FALSE, trunc = TRUE;
- size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0;
- size_t bs = 512, count = -1;
+ size_t out_full = 0;
+ size_t out_part = 0;
+ size_t in_full = 0;
+ size_t in_part = 0;
+ size_t count = -1;
+ size_t bs = 512;
ssize_t n;
- off_t seek = 0, skip = 0;
- FILE *statusfp;
- char *infile = NULL, *outfile = NULL, *buf;
+ off_t seek = 0;
+ off_t skip = 0;
+ int sync_flag = FALSE;
+ int noerror = FALSE;
+ int trunc = TRUE;
+ int oflag;
+ int ifd;
+ int ofd;
+ int i;
+ const char *infile = NULL;
+ const char *outfile = NULL;
+ char *buf;
for (i = 1; i < argc; i++) {
if (strncmp("bs=", argv[i], 3) == 0)
- bs = parse_number(argv[i]+3, dd_suffixes);
+ bs = bb_xparse_number(argv[i]+3, dd_suffixes);
else if (strncmp("count=", argv[i], 6) == 0)
- count = parse_number(argv[i]+6, dd_suffixes);
+ count = bb_xparse_number(argv[i]+6, dd_suffixes);
else if (strncmp("seek=", argv[i], 5) == 0)
- seek = parse_number(argv[i]+5, dd_suffixes);
+ seek = bb_xparse_number(argv[i]+5, dd_suffixes);
else if (strncmp("skip=", argv[i], 5) == 0)
- skip = parse_number(argv[i]+5, dd_suffixes);
+ skip = bb_xparse_number(argv[i]+5, dd_suffixes);
else if (strncmp("if=", argv[i], 3) == 0)
infile = argv[i]+3;
else if (strncmp("of=", argv[i], 3) == 0)
trunc = FALSE;
buf += 7;
} else if (strncmp("sync", buf, 4) == 0) {
- sync = TRUE;
+ sync_flag = TRUE;
buf += 4;
+ } else if (strncmp("noerror", buf, 7) == 0) {
+ noerror = TRUE;
+ buf += 7;
} else {
- error_msg_and_die("invalid conversion `%s'", argv[i]+5);
+ bb_error_msg_and_die("invalid conversion `%s'", argv[i]+5);
}
if (buf[0] == '\0')
break;
buf++;
}
} else
- usage(dd_usage);
+ bb_show_usage();
}
buf = xmalloc(bs);
if (infile != NULL) {
- if ((ifd = open(infile, O_RDONLY)) < 0)
- perror_msg_and_die("%s", infile);
+ ifd = bb_xopen(infile, O_RDONLY);
} else {
ifd = STDIN_FILENO;
- infile = "standard input";
+ infile = bb_msg_standard_input;
}
if (outfile != NULL) {
oflag = O_WRONLY | O_CREAT;
- if (!seek && trunc)
+ if (!seek && trunc) {
oflag |= O_TRUNC;
+ }
- if ((ofd = open(outfile, oflag, 0666)) < 0)
- perror_msg_and_die("%s", outfile);
+ if ((ofd = open(outfile, oflag, 0666)) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
if (seek && trunc) {
- if (ftruncate(ofd, seek * bs) < 0)
- perror_msg_and_die("%s", outfile);
- }
+ if (ftruncate(ofd, seek * bs) < 0) {
+ struct stat st;
- statusfp = stdout;
+ if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
+ S_ISDIR (st.st_mode)) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+ }
+ }
} else {
ofd = STDOUT_FILENO;
- outfile = "standard output";
- statusfp = stderr;
+ outfile = bb_msg_standard_output;
}
if (skip) {
- if (lseek(ifd, skip * bs, SEEK_CUR) < 0)
- perror_msg_and_die("%s", infile);
+ if (lseek(ifd, skip * bs, SEEK_CUR) < 0) {
+ bb_perror_msg_and_die("%s", infile);
+ }
}
if (seek) {
- if (lseek(ofd, seek * bs, SEEK_CUR) < 0)
- perror_msg_and_die("%s", outfile);
+ if (lseek(ofd, seek * bs, SEEK_CUR) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
}
while (in_full + in_part != count) {
+ if (noerror) {
+ /* Pre-zero the buffer when doing the noerror thing */
+ memset(buf, '\0', bs);
+ }
n = safe_read(ifd, buf, bs);
- if (n < 0)
- perror_msg_and_die("%s", infile);
- if (n == 0)
+ if (n < 0) {
+ if (noerror) {
+ n = bs;
+ bb_perror_msg("%s", infile);
+ } else {
+ bb_perror_msg_and_die("%s", infile);
+ }
+ }
+ if (n == 0) {
break;
- if (n == bs)
+ }
+ if (n == bs) {
in_full++;
- else
+ } else {
in_part++;
- if (sync) {
+ }
+ if (sync_flag) {
memset(buf + n, '\0', bs - n);
n = bs;
}
- n = full_write(ofd, buf, n);
- if (n < 0)
- perror_msg_and_die("%s", outfile);
- if (n == bs)
+ n = bb_full_write(ofd, buf, n);
+ if (n < 0) {
+ bb_perror_msg_and_die("%s", outfile);
+ }
+ if (n == bs) {
out_full++;
- else
+ } else {
out_part++;
+ }
+ }
+
+ if (close (ifd) < 0) {
+ bb_perror_msg_and_die("%s", infile);
+ }
+
+ if (close (ofd) < 0) {
+ bb_perror_msg_and_die("%s", outfile);
}
- fprintf(statusfp, "%d+%d records in\n", in_full, in_part);
- fprintf(statusfp, "%d+%d records out\n", out_full, out_part);
+ fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
+ (long)in_full, (long)in_part,
+ (long)out_full, (long)out_part);
return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff